Exchange Anisotropy in an Iron-Aluminum Alloy

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Abstract
Magnetic hysteresis loop and torque measurements were made on a polycrystalline Fe-Al alloy specimen, of 30 atomic percent Al and FeAl-type order, which had been cooled to 1.8°K in a magnetic field. The hysteresis loop measured parallel to this field was found to be asymmetrical with respect to the origin and considerably “squared up” as compared to the loop for zero field applied during cooling. The torque curves had large sinψ and somewhat smaller sin2ψ components; the rotational hysteresis, though decreasing with increasing field, was still appreciable at 8000 oe. The mechanism for these effects is believed to be an exchange anisotropy arising from a coexistence of ferromagnetism and antiferromagnetism in this Fe-Al alloy. However, the experimental results indicate significant deviations from the simple exchange anisotropy model originally proposed for the Co-CoO system.

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